Fire extinguisher tank



FIG. 1 is a perspective view of a fire extinguisher tank showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof from one side, the opposite side appearing as a mirror image;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a fire extinguisher tank, as shown and described. 